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651The National Groundwater and Contaminated Land Centre (NGWCLC)
652The evaluation of a Philips ammonium ion selective electrode (220/14/T)
653The greening of Grasmere: its plankton periodicity in 1988
654A strategic review of the petroleum refinery Industry Sector
655Guidelines for river corridor surveys in the NRA : February 1992. draft 3
656Second annual review of the Sid/Otter catchment management plan 1999
657Contribution of small streams to potential fish production in the Conwy catchment
658NRA strategy for reducing the concentration of pesticides in controlled waters
659The ecology and management of riverine trees : interim report
660Low-cost modifications of the Crump weir to improve fish passage
661Policy and practice for the protection of groundwater - Thames region appendix
662Policy and practice for the protection of floodplains
663'Sea Vigil' water quality monitoring : the Wash 1992-1993
664Second annual review of the Seaton, Looe and Fowey catchment management plan
665The Yarrow catchment : recommendations for statutory water quality objectives
666Leachate Migration Through The Triassic Sandstones At Burntstump Landfill And Elsewhere
667The evaluation of a Nico Elit 051 ammonium ion selective electrode (220/16/T)
668Guidance on the use of Bioassays in Ecological Risk Assessment
669The National Rivers Authority employee attitude survey : summary
670The Use of a Hydroacoustic Counter for Assessing Salmon Stocks
671Geochemical process modelling : progress report for the period Jan - March 1993 (0295/11/A)
672Pesticides in the aquatic environment 1997 : executive summary
673Targeted Monitoring Programme for Pharmaceuticals in the Aquatic Environment
674Mercury and methylmercury in the river Yare, Norfolk (OI/420/8/A)
675The Louth coastal catchment management plan : final report